Subscription/Registration/PopUp Errors

I am trying to use my home page as my subscription page. I have the subscription shortcode in the page, and the page looks nice, but when I click on the Sign Up button I get one of 2 error messages

1. SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long)


I checked pop-up subscription form on the Options menu but it does not seem to work. Any suggestions?